What is the missing number for this pair of equivalent ratios? 4 : 9 = ? : 27

Rewrite the following without an exponent. (5/8)-1

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)

Identify the number as a rational or irrational.explain. 127